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March-April 2017

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Who's Who in Mineral Names: Michael “Mike” Kokinos (b. 1927)

Named in honor of Michael Kokinos of Shingle Springs, California, kokinosite, Na2Ca2(V10O28)·24H2O, is a triclinic, sodium calcium decavanadate from the St. Jude mine, Gypsum Valley, Slick Rock district, San Miguel County, Colorado. The mineral was found by Micromounters' Hall of Fame (MMHF) member Joe Marty, discoverer of several new species from that region, and named in 2013 for fellow MMHF member Kokinos for his collecting and his mentoring of others in the collecting community. Kokinosite typically occurs as tablets or blades to 0.05 mm thick, with stepped faces, and 1 mm in maximum dimension. It is a transparent, pleochroic (orange yellow-orange), nonfluorescent mineral with a subadamantine luster and yellow streak. Kokinosite is brittle, with one good cleavage on {01}, an irregular fracture, and no apparent parting. The Mohs hardness is 1.5, and the density is 2.353 g/cm3 (calculated). The mineral was found growing on a corvusite-montroseite-bearing sandstone block and is closely associated with gypsum, huemulite, metarossite, pascoite, rossite, and wernerbaurite (Kampf et al. 2014). The type material is deposited in the collections of the Natural History Museum of Los Angeles County, Los Angeles, California.

Quintin Wight is the author of The Complete Book of Micromounting (Mineralogical Record, 1993).

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